About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
|
Presentation Title |
Connecting Plasticity to Hydrogen Embrittlement Using High Energy Synchrotron X-rays |
Author(s) |
Timothy Long, Kelly Nygren, Matthew P. Miller |
On-Site Speaker (Planned) |
Matthew P. Miller |
Abstract Scope |
Professor Robertson’s group has a long successful history of characterizing differences between hydrogen charged and uncharged specimens on the subgrain scale using TEM. Recently, his group has used high pressure torsion (HPT) of Nickel samples to produce samples with a range of large plastic strains without the complications of a fracture surface. This work used these HPT samples to understand plasticity differences by studying the distributions of intragrain lattice orientations using high energy x-ray diffraction (HEXD) at the Cornell High Energy Synchrotron Source (CHESS). Compared to uncharged specimens, some hydrogen-charged crystals had orientation distributions with larger skewness and kurtosis values. Using a simple kinematic model for plastic slip, strain heterogeneity was show to be a possible explanation of the differences. To study the evolution of the orientation distributions, in situ HEXD experiments to smaller plastic strains were also conducted on nickel samples. Consistent results were obtained. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, Mechanical Properties, |